Connection for producing oscillations with vacuum tubes



Feb. 2, 1926.' 1,571,278

L. KUHN 1 CONNECTION FCN oDuCINC osCTLLATToNs wTTH VACUUM TUBES Filed August 26, 1921 gary, filed Aug. 27, 1920, No. H. 6560; Chile,

Patented Feb. z, 192s.

UNITED- STATE-s PATENT OFFICE.

LUDWIG KUHN, or BERLIN-CHARLOTTENEURe, GERMANY, AssIGNoR To WEs'TING- :aoUsE ELECTRIC a MANUFACTURING COMPANY, A CORPORATION or PENNSYL- VANIA.

CONNECTION FOR PRODUCING OSCILIJATIO-NS WITH VACUUM- TUBES.

Application led Augustp26, 1921. Serial No. 495,736.

(GRANTED UNDER TEE I'RcvIsIoNsor THE ACT or MARII a, 1921, .4I STAT. n., 1313.)

'vented certain new and useful Improvements in Connections for Producing Oscillations with Vacuum Tubes (for which I have iled applications asfollows: Germany, filed Sept. 27,1917-, now German Patent No. 310,152; Germany, filed April 26, 1919,` No. 76,903; Argentine, filed Dec. 9', 1920, now Patent No.` 17,742; lelgium, filed July 9. 1920, now Patent No. 289,103; Bolivia,`filed Febr. 2, 1921, now Patent No. 155; Brazil, filed Jan. 7, 1921, 'now Patent No. 13,196; Brit. India, filed Nov. 25, 1920, now Patent No. 6421; Canada, filed Nov. 17, 1920, No 248,295; Denmark, filed June 30, 1920, No. 1971; Great Britain, tiled July 7, 1920, now Patent No. 148,803; Finland, filed Sept. 29. 1920, now Patent No. 8724; Holland, filed Mar. 5, 1920, No. 14,205; Italy, filed July 6,

1920, No. 292/60; Japan, filed Oct. 1920, Nd;`

61,497; Norway, filed June 30, 1920, No.

21,173; Rumania, filed Dec. 22,- 1921, No., 7 51; S. Africa, filed Nov. 20, 1920, now Pat- Y ent` 1280; Sweden, filed Jan. 2, 1920'No. 8 and July 12, 1919, No. 3227; Switzerland,

"filed Oct.,.18, 1920, now Patent No. 95,307;

Czechoslovakia, vliled July .9, 1920, No. l) 5610 and 'July 27, 1922, No. 3447 Hun'- liled Jan. 6, 1921; Spain, tiled Mar. 24, 19,20, nov:r Patent No. 73,107; Australia, filed July 12, 1920, No. 16,613; France, liled Dec. 2, 1920 now Patent No. 531,894; Venezuela,

yfiled Jan. 28, 1921, now Patent No.525), of

iwhich the following isl a specification.

The new connection is illustrated in Figure l, Fig. 2 shows a tube for producing oscillations and illustrates amodied form of construction.

In Fig.- 1,'1 is the vacuum tube, 2 its incandescent cathode, 3 theL grid, 4 the anode. The anode-circuit is from the anode, through the battery 5-with condenser 6 in parallel, through a coil y7, to the incandescent cathode 8. Coil 7, may, if desired, be variable. The antenna 9 is connected to is excited by la completely independent oscil- Y lation circuit consisting of coil 12 and condenser 1'3.

The novelty of the connection consists in there being no inductive or capacitative coupling between the anode circuit andthe oscillation system of the gri-d. As compared with the present state of the art, it represents novelty in that hitherto it has been Vconsidered necessaryto provide a return coupling between the anode circuit which conducts the strengthened oscillations and 'the grid circuit which serves to control and maintain the oscillations.` Whereas they known .connections have the disadvantage'of being suitable either only for the production of very rapid or only for the production of relatively slow oscillations, it is possible With-the present connection lto produce an almost unlimited range of wave-lengths .and at the same time to work with absolute eiiiciency.l .Of first importance, however, is

the entire absence of auxiliary oscillations.`

The wave-length produced is on the other Y hand completely one-wave, which is, I believe, the explanation of the excellent degree of efficiency. v

To prevent auxiliary oscillations it is im.- portant to couple the antenna with the anode `circuit, preferably conductively. Various wave-lengthsas desired are secured by adjustingo the .grid circuit to the desired Wave and so tuning the antenna that a measuring instrument therein gives maximum deflec- AQtion.

. In order to tunefthe ltwo circuits as quickly aspossible and as la unit, the tuning devices, for these circuits or the parts of the vmechanism which lserve them may beY llnade mechanically interdependent.. 'f By this means, it is possible simultaneously, and, if desired, with a common'operating means, to bring the circuits to identical frequency. In4 the case where these circuits are coupled, such .coupling can, ifnecessary, be brought into mechanical dependence upon the tuning devices of the circuits so that Vthe coupling may also be simultaneously changed with the syntonization of the circuits.

Under f the coil 7 through a variometer 10, or it may' these conditions the circuits can be synbe coupled inductively with it and be also tonized continuously, whereas' the` coupling -pl'ovdedwth'a GOndenSei' 1.1- The grid 3 4'LS changed by steps. Similarly, the synionization in the circuits can be changed by steps.

If such an apparatus for producing' oscillations is used for heterodyning, it is possible to adjust the tuning devices' of the beterodyne in such a way thatV a certain ,hange in the tuning of the generator would correspond to a similar change in the reeeiver in such a manner that the frequencies for which the receiver and the generator are respectively tuned lie within practical range for producing beats. It is then possible to secure mechanical dependence between the tuning devices, the switch members, and the like, of the receiver, and those of the heterodyning generator, so that they can both be operated by a common element.

In Fig. 2 rrepresents a tube for producing oscillations, s its controlling circuit, e its energizing circuit, a the tuning means in the first, b the tuning means in the latter,`

which means are formed, by way of example, as variable inductors and condensers and are so disposed that they can be moved by a handle h upon a common shaft in such a way that both circuits are set to about equal frequencies.

Fig. 3 illustrates a `form of construction, by way of example, which, in addition to the elements of Fig. 2, is provided with a coupling lc adjustable by steps. All the electrical elements required for making the adjustments are, in this ,case also, operated by a single mechanical element h. It is understood, however, that the mechanical connections are not so disposed that a particular electrical adjustment'corresponds to a given angle of rotation of the handle. The ratio of mechanical movement between the tuning devices land the common driving member L may, for example, be made to di'er for the several tuning devices.

This result could be secured by the use of sprocket wheels, skids, or the like, in

place of differently geared drives. By the ing or as aheterodyne device for receiving..

The receiving circuit or the sending circuit may be connected by a common separable connector and the antenna when connected to the illustrated device has needs only to be tuned in the usual way.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is -to be performed, I declare that what I claim is:

1. In a vacuum-tube device, a tuned plate circuit, a tuned grid circuit, each of said tuned circuits including a variable inductor and a variable capacity and means, including a mechanical connection between said variable reactors, for simultaneously tuning both circuits..

2. In a vacuum-tube device, a plate .circuit, a grid circuit, an adjustable coupling between said circuits, yadjustable devices in each of the circuits for tuning `the same andmeans for simultaneously7 changing the adjustment of each of said adjusting devices.`

3. In a vacuum-tube device., a plate cir# cuit, a grid circuit, an adjustable coupling between said circuits, adjustable devices in each of the circuits for tuning the same and means for simultaneously changing the adjustmentof each of said adjusting devices,

saidl means including a common actuator j and a mechanical 'connection between sald DR. ING. LUDWIG y`KHN. 

